metallurgical valve
| nominal diameter(dn)（mm） | dn300-dn2000 | |
| workers said pressure (mpa) | ≤0.25 | |
| test pressure | case | 1.5倍工作压力 |
| seal | 1.1倍工作压力 | |
| sealing rating | a | |
| on/off differential pressure（mpa） | ≤0.03 | |
| working temperature | ≤250 | |
| applicable medium | gas | |